Here are the solution of Java Arraylist Hacker Rank Solution

public static void main(String[] args) { Scanner sc =new Scanner( System.in) ; int lines =sc.nextInt() ; ArrayList array_list = new ArrayList() ; for (int i=0 ;i < lines;i++ ){ int colLineItem = sc.nextInt(); array_list.add(new ArrayList<>()); for(int y =0 ;y

                    } catch (Exception e) {
                        System.out.println("ERROR!");
                    }
                }

}

}

public static void main(String[] args) { Scanner sc =new Scanner( System.in) ; int lines =sc.nextInt() ; ArrayList array_list = new ArrayList() ; for (int i=0 ;i < lines;i++ ){ int colLineItem = sc.nextInt(); array_list.add(new ArrayList<>()); for(int y =0 ;y

                    } catch (Exception e) {
                        System.out.println("ERROR!");
                    }
                }

}

}

import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    List<List<Integer>> listOfArray = new ArrayList<>();
    Scanner s= new Scanner(System.in);
    int n =s.nextInt();
    for(int i=0;i<n;i++){
        int d=s.nextInt();
        List<Integer> listf = new ArrayList<Integer>() ;
        for(int j=0;j<d;j++){
        listf.add(s.nextInt());
        }
        listOfArray.add(listf);
    }
   // System.out.println(listOfArray);
   int q =s.nextInt();
   for(int i=0;i<q;i++){
     int x= s.nextInt();
     int y =s.nextInt();
     try{
    System.out.println( listOfArray.get(x-1).get(y-1));
     }
     catch(Exception ex){
         System.out.println("ERROR!");
     }
   }
        s.close();


}

}